1222412145520 has 20 divisors (see below), whose sum is σ = 2842108238520. Its totient is φ = 488964858176.

The previous prime is 1222412145511. The next prime is 1222412145523. The reversal of 1222412145520 is 255412142221.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222412145523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7640075830 + ... + 7640075989.

It is an arithmetic number, because the mean of its divisors is an integer number (142105411926).

Almost surely, 2^{1222412145520} is an apocalyptic number.

1222412145520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222412145520 is an abundant number, since it is smaller than the sum of its proper divisors (1619696093000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222412145520 is a wasteful number, since it uses less digits than its factorization.

1222412145520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15280151832 (or 15280151826 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 1222412145520 its reverse (255412142221), we get a palindrome (1477824287741).

The spelling of 1222412145520 in words is "one trillion, two hundred twenty-two billion, four hundred twelve million, one hundred forty-five thousand, five hundred twenty".